RHOPTAS. 29 



the throat black, or dark brown, spotted with white. The bill is 

 small and slender. The wing is rounded, the fourth, fifth, and 

 sixth primary-quills longest, the third about equal to, or very 

 slightly shorter than, the seventh. The tail is short and 

 very slightly rounded, and measures about four-fifths the length 

 of the wing and about three times the length of the exposed 

 culmen. Male and female similar in colour in the typical species, 

 but differ in some of the others. 



366. Rhopias gutturalis. 



Brown-bellied Ant-bird. 



Myrmofherula gutturalis Sclater & Salvin, IbLs, 1881, p. 269 (Bartica 

 Grove) ; Salvin, op. cit. 1883, p. 425 (Merume Mts., E. Atapurau, 

 Bartica Ghrove); Sclater, Cat.B. Brit. Mus. xv. p. 233, 1890 (Quonga); 

 Brabourne & Chubb, B. S. Amer. i. p. 197, no. 1969, 1912. 



Adult male. General colour of the upper surface olive-brown 

 including the head, ear-coverts, back, wings, and tail ; upper wing- 

 coverts tipped with white; primary and secondary quills hair-brown 

 on the inner webs, which have pale margins ; tail somewhat darker 

 than the bacl^ and inclining to rufous-brown ; throat black, with 

 white pear-shaped marks at the tips of the feathers ; sides of face 

 and breast lead -grey; sides of the body, abdomen, and under 

 tail-coverts olive-brown ; under wing-coverts isabelline bufi". 



Total length 104 mm., exposed culmen 13, wing 50, tail 39, 

 tarsus 16. 



Adult female. Differs from the adult male in being rufous-brown 

 above, instead of olive-brown, and in the absence of the black and 

 white throat-patch, the grey on the breast, and olive-brown 

 abdomen — these parts being fulvous in the female. Wing 52 mm. 



The male and female birds described were collected on the 

 Supenaam River in 1911. 



Breeding-season. Unknown in British Guiana. 



Nest. Unrecorded in British Guiana. 



Eggs. Undescribed from British Guiana. 



Range in British Guiana. Mou^nt Roriama, Ituribisi River, 

 Supenaam River, Anarica River, Arwye Creek (McConnell col- 

 lection) ; Bartica, Merum6 Mountains, Kamarang River, Quonga 

 {^WJiitely). 



Extralimital Range. Surinam (Penard) . 



Habits. Unrecorded in British Guiana. 



